Light source module and projection apparatus

ABSTRACT

A light source module and a projection apparatus are provided. The light source module includes a blue light source, a red light source, a wavelength conversion wheel and a filter wheel. The blue light source provides a blue light beam. The red light source provides a red light beam. The wavelength conversion wheel is disposed on a transmission path of the blue light beam and has a wavelength conversion region and a transparent region. The blue light beam passes through the transparent region. The blue light beam is converted into a green light beam by the wavelength conversion region, so as to generate the green light beam. The filter wheel is disposed on transmission paths of the blue light beam and the red light beam and includes a filter region and a diffusion region. A filter spectrum of the filter region includes a first bandwidth that allows the green light beam to pass through and a second bandwidth that allows a red light beam to pass through. The first bandwidth and the second bandwidth are separated with each other. The blue light beam passes through the diffusion region. The light source module and the projection apparatus including the same have a broad color gamut and are able to reduce loss of energy.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serialno. 201610988101.3, filed on Nov. 10, 2016. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to an optical module and an optical apparatus, andparticularly relates to a light source module and a projectionapparatus.

Description of Related Art

Currently, the demands for color performance of the projectionapparatuses have become much higher. The apparatuses with a broadercolor gamut are more favorable to the consumers. To provide a broadercolor gamut, a projection apparatus may adopt two or more light sourcesin different colors to provide light beams in different colors. Forexample, a red solid-state light source is added to a projectionapparatus originally adopting only a blue solid-state light source, soas to provide a red light beam. Since the color of the red light beam israther pure, a broader color gamut is enabled. In such projectionapparatus, a blue light beam is provided to excite the green color on aphosphor wheel or a yellow phosphorous powder to generate a green oryellow light beam. The green light beam passes through a green filter ona filter wheel to generate a green light beam meeting demands. A part ofthe yellow light beam passes through a red filter to form red light, andanother part of the yellow light beam passes through a transparentregion on a filter wheel to form a yellow light beam. The rest of theblue light beam passes through a hollow part of the phosphor wheel andthen passes through the transparent region on the filter region. Toenhance the performance of the red color, the red solid-state lightsource is added to a light path to facilitate rendering of the redcolor. However, the conventional process of exciting a spectrum by aphosphorous powder and obtaining a green light beam by filtering with afilter wheel may result in loss of optical energy.

The information disclosed in this “Description of Related Art” sectionis only for enhancement of understanding of the background of theinvention and therefore it may contain information that does not formthe prior art that is already known to a person of ordinary skill in theart. Furthermore, the information disclosed in this “Description ofRelated Art” section does not mean that one or more problems to beresolved by one or more embodiments of the invention were acknowledgedby a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The invention provides a light source module and a projection apparatushaving a broader color gamut and capable of reducing a loss of energy.

Other objects and advantages of the invention can be further illustratedby the technical features broadly embodied and described as follows.

In order to achieve one or a portion of or all of the objects or otherobjects, an embodiment of the invention provides a light source moduleconfigured to provide an illumination beam. The light source moduleincludes a blue light source, a red light source, a wavelengthconversion wheel, and a filter wheel. The blue light source isconfigured to provide a blue light beam. The red light source isconfigured to provide a red light beam. The wavelength conversion wheelis disposed on a transmission path of the blue light beam and has afirst wavelength conversion region and a transparent region. The firstwavelength conversion region and the transparent region are rotated ontothe transmission path of the blue light beam by turns. The blue lightbeam passes through the transparent region. The blue light beam isconverted by the first wavelength conversion region to generate a greenlight beam. The filter wheel is disposed on transmission paths of theblue light beam and the red light beam. The filter wheel includes afirst filter region and a diffusion region. A filter spectrum of thefirst filter region includes a first bandwidth allowing the green lightbeam to pass through and a second bandwidth allowing the red light beamto pass through. The first bandwidth and the second bandwidth areseparated from each other. The blue light beam passes through thediffusion region.

In order to achieve one or a portion of or all of the objects or otherobjects, an embodiment of the invention provides a projection apparatusincluding a light source module, an imaging element, and a projectionlens. The light source is configured to provide an illumination beam.The light source module includes a blue light source, a red lightsource, a wavelength conversion wheel, and a filter wheel. The bluelight source is configured to provide a blue light beam. The red lightsource is configured to provide a red light beam. The wavelengthconversion wheel is disposed on a transmission path of the blue lightbeam. The wavelength conversion wheel has a first wavelength conversionregion and a transparent region. The first wavelength conversion regionand the transparent region are rotated onto the transmission path of theblue light beam by turns. The blue light beam passes through thetransparent region. The blue light beam is converted by the firstwavelength conversion region to generate a green light beam. The filterwheel is disposed on transmission paths of the blue light beam and thered light beam. The filter wheel includes a first filter region and adiffusion region. A filter spectrum of the first filter region includesa first bandwidth allowing the green light beam to pass through and asecond bandwidth allowing the red light beam to pass through. The firstbandwidth and the second bandwidth are separated from each other. Thelight source module provides an illumination beam based on the bluelight source, the red light source, the wavelength conversion wheel, andthe filter wheel. The imaging element is disposed on a transmission pathof the illumination beam and configured to convert the illumination beaminto an image beam. The projection lens is disposed on the transmissionpath of the image beam and configured to project the image beam to aprojection target.

Based on the above, the embodiments of the invention have at least thefollowing advantages effects. In the exemplary embodiments of theinvention, the light source module includes the red light source. Inaddition, the filter spectrum of the first filter region includes thefirst bandwidth for the green light beam to pass through and the secondbandwidth for the red light beam to pass through. Therefore, the lightsource module and the projection apparatus with the light source modulehave a broad color gamut and are able to reduce loss of energy.

Other objectives, features and advantages of the present invention willbe further understood from the further technological features disclosedby the embodiments of the present invention wherein there are shown anddescribed preferred embodiments of this invention, simply by way ofillustration of modes best suited to carry out the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate exemplaryembodiments of the invention and, together with the description, serveto explain the principles of the invention.

FIG. 1 is a schematic view illustrating a projection apparatus accordingto an embodiment of the invention.

FIG. 2 is a schematic view illustrating a wavelength conversion wheeland a filter wheel according to an embodiment of the invention.

FIG. 3 is a view illustrating a filter spectrum of a first filter regionof the filter wheel according to the embodiment shown in FIG. 2.

FIGS. 4, 5, and 6 are respectively schematic views illustrating acurrent driving a light source in different operation modes according tothe embodiments shown in FIGS. 1 and 2.

FIG. 7 is a schematic view illustrating a wavelength conversion wheeland a filter wheel according to another embodiment of the invention.

FIGS. 8, 9, and 10 are respectively schematic views illustrating acurrent driving a light source in different operation modes according tothe embodiments shown in FIGS. 1 and 7.

FIG. 11 is a schematic view illustrating a wavelength conversion wheeland a filter wheel according to another embodiment of the invention.

FIGS. 12 and 13 are respectively schematic views illustrating a currentdriving a light source in different operation modes according to theembodiments shown in FIGS. 1 and 11.

DESCRIPTION OF THE EMBODIMENTS

In the following detailed description of the preferred embodiments,reference is made to the accompanying drawings which form a part hereof,and in which are shown by way of illustration specific embodiments inwhich the invention may be practiced. In this regard, directionalterminology, such as “top,” “bottom,” “front,” “back,” etc., is usedwith reference to the orientation of the Figure(s) being described. Thecomponents of the invention can be positioned in a number of differentorientations. As such, the directional terminology is used for purposesof illustration and is in no way limiting. On the other hand, thedrawings are only schematic and the sizes of components may beexaggerated for clarity. It is to be understood that other embodimentsmay be utilized and structural changes may be made without departingfrom the scope of the invention. Also, it is to be understood that thephraseology and terminology used herein are for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having” and variations thereof herein ismeant to encompass the items listed thereafter and equivalents thereofas well as additional items. Unless limited otherwise, the terms“connected,” “coupled,” and “mounted” and variations thereof herein areused broadly and encompass direct and indirect connections, couplings,and mountings. Similarly, the terms “facing,” “faces” and variationsthereof herein are used broadly and encompass direct and indirectfacing, and “adjacent to” and variations thereof herein are used broadlyand encompass directly and indirectly “adjacent to”. Therefore, thedescription of “A” component facing “B” component herein may contain thesituations that “A” component directly faces “B” component or one ormore additional components are between “A” component and “B” component.Also, the description of “A” component “adjacent to” “B” componentherein may contain the situations that “A” component is directly“adjacent to” “B” component or one or more additional components arebetween “A” component and “B” component. Accordingly, the drawings anddescriptions will be regarded as illustrative in nature and not asrestrictive.

FIG. 1 is a schematic view illustrating a projection apparatus accordingto an embodiment of the invention. Referring to FIG. 1, a projectionapparatus 100 of the embodiment includes a light source module 110, animaging element 120, and a projection lens 130. In the embodiment, thelight source module 110 is configured to provide an illumination beam IWto the imaging element 120. The imaging element 120 is disposed on atransmission path of the illumination beam IW. The imaging element 120is configured to convert the illumination beam IW into an image beam IM.The projection lens 130 is disposed on a transmission path of the imagebeam IM. The projection lens 130 is configured to project the image beamIM to a projection target 200, such as a screen, a surface, or othersuitable projection targets.

In the embodiment, the imaging element 120 is, for example, a reflectiontype light modulator, such as a liquid crystal on silicon (LCoS) panel,a digital micro-mirror device (DMD). Alternatively, the imaging element120 may also be a transmission type light modulator, such as atransparent liquid crystal panel, an electro-optical modulator, amagneto-optic modulator, an acousto-optic modulator (AOM). It should benoted that the invention does not intend to impose a limitation on theconfigurations and types of the imaging element 120. In the embodiment,people having ordinary skills in the art are already familiar with themethods, detailed processes, and practices as to the conversion of theillumination beam IW into the image beam IM by the imaging element 120.Thus, details in this respect will not be reiterated in the following.

In the embodiment, the projection lens 130 is a combination of one ormore optical lenses having a refractive power, for example. As examples,the projection lens 130 may include a biconcave lens, a biconvex lens, aconcave-convex lens, a convex-concave lens, a plane-convex lens, ameniscus lens, a plane-concave lens, or a combination thereof. In anembodiment, the projection lens 130 may also include a planar opticallens and project the image beam IM to the projection target 200 throughreflection or transmission. It should be noted that the configurationsand types of the projection lens 130 of the invention are not limitedthereto.

In the embodiment, the light source module 110 includes a blue lightsource 112B, a red light source 112R, a wavelength conversion wheel 114,a filter wheel 116, a plurality of reflective elements 111 and 113, aplurality of light combining elements 115 and 117, and a lighthomogenizing element 119. As examples, the homogenizing element 119 mayinclude an integration rod, a fly eye lens, or a combination of theoptical elements, but the invention is not limited thereto.Specifically, in the embodiment, the blue light source 112B isconfigured to provide a blue light beam IB, the red light source 112R isconfigured to provide a red light beam IR, and the wavelength conversionwheel 114 is disposed on a transmission path of the blue light beam IB.The wavelength conversion wheel 114 is a phosphor wheel, for example.The wavelength conversion wheel 114 has at least one wavelengthconversion region and a transparent region. The wavelength conversionregion and the transparent region are rotated onto the transmission pathof the blue light beam IB by turns The blue light beam IB is convertedby the wavelength conversion region to generate a green light beam IG ora yellow light beam IY. The blue light beam IB passes through thetransparent region. The filter wheel 116 is disposed on transmissionpaths of the blue light beam IB and the red light beam IR. The filterwheel 116 is a filter color wheel, for example. The filter wheel 116 hasa filter region and a diffusion region. The filter region and thediffusion region are configured for light beams in different colors topass through.

In the embodiment, the reflective elements 111 and 113 are disposed onthe transmission path of the blue light beam IB, so as to adjust thetransmission path of the blue light beam IB. The light combining element115 is disposed on the transmission paths of the blue light beam IB andthe red light beam IR to combine the blue light beam IB with the redlight beam IR. The light combining element 117 is disposed on thetransmission paths of the blue light beam IB, the red light beam IR, thegreen light beam IG, and the yellow light beam IY to integrate the bluelight beam IB, the red light beam IR, the green light beam IG, and theyellow light beam IY. The light homogenizing element 119 are disposed ona light path between the filter 116 and the imaging element 120 tohomogenize the light and thus allow the light beam passing through thelight homogenizing element 119 to be uniformly output from the lightsource module 110, thereby avoiding inconsistent brightness of theprojection apparatus 100 on the light path.

In the embodiment, a light source adopted in the light source module 110is, for example, a laser diode (LD), a light emitting diode (LED), anorganic light emitting diode (OLED), or any other light sources meetinga size requirement in the practical design. The invention does notintend to impose a limitation in this regard. In the embodiment, thelight combining elements 115 and 117 are semi-transmissive lenses (alsoreferred to as dichroic mirrors), for example, capable of deflectingreflected light transmitted to the lens toward another direction andallowing penetrating light transmitted to the lens to pass through. Inthe embodiment, the numbers and locations of the reflective elements 111and 113, the light combining elements 115 and 117, and the integrationrod 119 are merely described for an illustrative purpose and shall notbe construed as limitations of the invention. The numbers and locationsof the optical elements may be modified based on different opticalframeworks of the light source module 110.

FIG. 2 is a schematic view illustrating a wavelength conversion wheeland a filter wheel according to another embodiment of the invention.Referring to FIGS. 1 and 2, in the embodiment, the wavelength conversionwheel 114 includes a first wavelength conversion region 114G and atransparent region 114B. The blue light beam IB is converted by thefirst wavelength conversion region 114G to generate the green light beamIG, and the blue light beam IB passes through the transparent region114B. In the embodiment, the filter wheel 116 includes a first filterregion 116G and a diffusion region 116B. The green light beam IG and thered light beam IR pass through the first filter region 116G, as shown ina filter spectrum illustrated in FIG. 3. The details of the filterspectrum will be described in the subsequent paragraphs. In addition,the first filter region 116G includes a first sub-region 116_1, a secondsub-region 116_2, and a third sub-region 116_3. The blue light beam IBpasses through the diffusion region 116B. In the embodiment, thewavelength conversion wheel 114 and the filter wheel 116 have the samerotation speed. The first wavelength conversion region 116G correspondsto the first filter region 116G. The transparent region 114B correspondsto the diffusion region 116B. Besides, in the embodiment, the wavelengthconversion wheel 114 and the filter wheel 116 have the same rotationspeed. The first wavelength conversion region 114G corresponds to thefirst filter region 116G, and the transparent region 114B corresponds tothe diffusion region 116B.

FIG. 3 is a view illustrating a filter spectrum of the first filterregion 116G of the filter wheel according to the embodiment shown inFIG. 2. Referring to FIGS. 2 and 3, a filter spectrum FS of the firstfilter region 116G includes a first bandwidth BWG that allows the greenlight beam to pass through and a second bandwidth BWR that allows thered light beam to pass through. In addition, the first bandwidth BWG andthe second bandwidth BWR are separated from each other. In FIG. 3, aspectral line IGS is an optical spectrum of the green light beam IG, forexample, and a spectral line IRS is an optical spectrum of the red lightbeam IR, for example. Therefore, in the embodiment, the green light beamIG and the red light beam IR pass through the first filter region 116G.Besides, in the embodiment, people having ordinary skills in the art arefamiliar with fabrication of the filter spectrum FS simultaneouslyincluding the first bandwidth BWG and the second bandwidth BWR and therelated techniques, so details in this respect will not be reiterated inthe following.

FIGS. 4, 5, and 6 are respectively schematic views illustrating acurrent driving a light source in different operation modes according tothe embodiments shown in FIGS. 1 and 2. Referring to FIGS. 4, 5, and 6,respective blocks marked with R, G, B, and Y in FIGS. 4, 5, and 6indicate that, in one round of rotation of the wavelength conversionwheel 114 and the filter wheel 116, light beams of corresponding colorsare output by the filter wheel 116 in respective time intervals taken upby the respective blocks. For example, the block marked with R indicatesthat the filter wheel 116 outputs the red light beam IR during theinterval, the block marked with G indicates that the filter wheel 116outputs the green light beam IG during the interval, the block markedwith B indicates that the filter wheel 116 outputs the blue light beamIB during the interval, and the block marked with Y indicates that thefilter wheel 116 outputs the yellow light beam IY during the interval.

FIGS. 4, 5, and 6 are respectively schematic views illustrating acurrent driving a light source in different operation modes according tothe embodiments shown in FIGS. 1 and 2. Referring to FIGS. 1, 2, and 4,in a first operation mode of FIG. 4, when the first sub-region 116_1 andthe third sub-region 116_3 are rotated onto a transmission path of thered light beam IR, a current 210 for driving the red light source 112Ris at a high level H. Thus, the red light source 112R is turned on toprovide the red light beam IR. When the second sub-region 116_2, thediffusion region 116B, and the third sub-region 116_3 are rotated onto atransmission path of the blue light beam IB, a current 220 for drivingthe blue light source 112B is at the high level H, while a current 310for driving the red light source 112R is at a low level L (i.e., turnedoff). Thus, the blue light source 112B is turned on to provide the bluelight beam IB. In other words, in the first operation mode, the bluelight source 112B is turned on during the intervals of the blocks G, B,and Y, and the red light source 112R is turned on during the intervalsof the blocks R and Y and turned off during the intervals of the blocksG and B.

Then, referring to FIGS. 1, 2, and 5, levels of a second operation modeshown in FIG. 5 are similar to those of first operation mode, and thesecond operation mode mainly differs from the first operation mode inthat the time periods when the red light source 112R and the blue lightsource 112B are turned on during the intervals of the blocks R and G aredifferent. In the second operation mode, during the intervals of theblocks R and G, the time period when the red light source 112R is turnedon is shorter than the time period when the blue light source 112B isturned on. Thus, in the second operation mode, the time periods when thered light source 112R and the blue light source 112B are turned on areadjustable to configure time durations for the filter wheel 116 tooutput light beams in different colors. For example, in the secondoperation mode, the time period for the filter wheel 116 to output thered light beam IR is shorter than the time period for the filter wheel116 to output the blue light beam IB. Accordingly, fine-tuning of alocation of a color point on a gamut mapping is enabled. In addition,fine-tuning of the time periods when the red light source 112R and theblue light source 112B are turned on during the blocks R and G in thesecond operation mode is taken as an example. However, the time periodswhen the red light source 112R and the blue light source 112B in otherblocks are turned on may also be fine-tuned in the second operationmode. Thus, the invention is not limited to the example.

Referring to FIGS. 1 and 6 again, in a third operation mode of FIG. 6,when the third sub-region 116_3 is rotated onto the transmission path ofthe red light beam IR, the current 210 for driving the red light source112R is at the high level H. Therefore, the red light source 112R isturned on to provide the red light beam IR. When the first sub-region116_1, the second sub-region 116_2, and the diffusion region 116B arerotated onto the transmission path of the blue light beam IB, a current120 for driving the blue light source 112B is at the high level H, andthe current 210 for driving the red light source 112R is at the lowlevel L. Accordingly, the blue light source 112B is turned on to providethe blue light beam IB. In other words, in the third operation mode, theblue light source 112B is turned on during the intervals of the blocks Gand B, and the red light source 112R is turned on during the interval ofthe block R. In addition, the third operation mode does not have theblock Y. Therefore, in the third operation mode, the time periods whenthe red light source 112R and the blue light source 112B are turned onare adjustable to configure types of colored light beams output by thefilter wheel 116. For example, in the third operation mode, the filterwheel 116 outputs the green light beam IG, the blue light beam IB, andthe red light beam IR. Therefore, the green light beam IG, the bluelight beam IB, and the red light beam IR output by the filter wheel 116may result in purer white light after being mixed by the lighthomogenizing element 119.

FIG. 7 is a schematic view illustrating a wavelength conversion wheeland a filter wheel according to another embodiment of the invention.Referring to FIGS. 1 and 7, a wavelength conversion wheel 214 and afilter wheel 216 of FIG. 7 serve as another embodiment of the wavelengthconversion wheel 114 and the filter wheel 116 of the light source module110 of FIG. 1. Like components and elements are described with likereference numerals, and details in this respect will not be repeated inthe following.

In the embodiment, the wavelength conversion wheel 214 includes a firstwavelength conversion region 214G, a second wavelength conversion region214Y, and a transparent region 214B. The first wavelength conversionregion 214G, the second wavelength conversion region 214Y, and thetransparent region 214B are rotated onto the transmission path of theblue light beam IB by turns. The blue light beam IB is converted by thefirst wavelength conversion region 214G to generate the green light beamIG. The blue light beam IB is converted by the second wavelengthconversion region 214Y to generate the yellow light beam IY. The bluelight beam IB passes through the transparent region 214B. In theembodiment, the filter wheel 216 includes a first filter region 216G, asecond filter region 216R, a third filter region 216Y, and a diffusionregion 216B. The green light beam IG and the red light beam IR passthrough the first filter region 216G. The red light beam IR passesthrough the second filter region 216R. The third filter region 216Y is atransparent glass region, for example, and the yellow light beam IY andlight beams in other colors pass through the third filter region 216Y.The blue light beam IB passes through the diffusion region 216B.

Referring to FIGS. 1 and 8, in a fourth operation mode of FIG. 8, whenthe second filter region 216R is rotated onto the transmission path ofthe red light beam IR, the current 210 for driving the red light source112R is at the high level H. Therefore, the red light source 112R isturned on to provide the red light beam IR. When the filter wheel 216rotates, the current 320 for driving the blue light source 112B is alsoat the high level H. Therefore, the blue light source 112B is turned onto provide the blue light beam IB. The current 310 of the red lightsource 112R is switched to the low level L. In other words, in thefourth operation mode, the blue light source 112B is constantly turnedon during the intervals of the blocks R, G, B, and Y, while the redlight source 112R is turned on during the interval of the block R.

Then, referring to FIGS. 1 and 9, in a fifth operation mode of FIG. 9,when the second filter region 216R and the first filter region 216G arerotated onto the transmission path of the red light beam IR, the current210 for driving the red light source 112R is at the high level H.Therefore, the red light source 112R is turned on to provide the redlight beam IR. In the embodiment, the level of the current 310 duringthe interval of the block G is between the high level H during theinterval of the block R and the low level L during the interval of theblock B, indicating that a brightness of the red light beam IR is lowerduring the interval of the block G than during the interval of the blockR. However, in an embodiment, the level of the current 310 during theinterval of the block G may also be equal to the high level H during theinterval of the block R. The invention does not intend to impose alimitation in this regard. When the filter wheel 216 rotates, thecurrent 320 for driving the blue light source 112B is maintained at thehigh level H. Namely, the blue light source 112B is turned on to providethe blue light beam IB. In other words, in the fifth operation mode, theblue light source 112B is constantly turned on during the intervals ofthe blocks R, G, B, and Y, while the red light source 112R is turned onduring the intervals of the blocks R and G.

In addition, in the fifth operation mode of FIG. 9, the red light source112R is also turned on during the interval of the block G. The currentof the red light source 112R may be suitably adjusted, such as beingadjusted to be lower than or equal to the high level H during theinterval of the block R. In the embodiment, since the red light beam IRpasses through the first filter region 216R, as shown in the filterspectrum of FIG. 3, in a green color gamut of color gamut coordinates,the fifth operation mode of the light source module 110 of FIG. 9 isable to provide a different color gamut coordinate point on the colorgamut coordinates, as compared with the fourth operation mode of FIG. 8.Besides, in the embodiment, the red light source 112R is also turned onduring the interval of the block G. Therefore, an overall brightness ofthe light beam of the light source module 110 is also facilitated,thereby reducing an energy loss caused by the filter wheel 216. Comparedwith the fourth operation mode, the light source module 110 provides abroader color gamut in the fifth operation mode.

Referring to FIGS. 1 and 10, a sixth operation mode of FIG. 10 issimilar to the fifth operation mode of FIG. 9. However, a differencelies in that, in the sixth operation mode, when the second filter region216R, the first filter region 216G, and the third filter region 216Y arerotated onto the transmission path of the red light beam IR, the current310 for driving the red light source 112R is located at the high level H(the current 310 for the red light source 112R during the interval ofthe block G may also be suitably adjusted as in the fifth operationmode), for example. Therefore, the red light source 112R is turned on toprovide the red light beam IR. In the embodiment, the level of thecurrent 310 during the interval of the block Y is also equal to the highlevel H. In other words, the brightness of the red light beam IR duringthe interval of the block Y is equal to the brightness of the red lightbeam IR during the interval of the block R. In an embodiment, the levelof the current 310 during the interval of the block Y may also be lowerthan the high level H during the interval of the block R. The inventiondoes not intend to impose a limitation in this regard. When the filterwheel 216 rotates, the current 320 for driving the blue light source112B is at the high level H. Namely, the blue light source 112B isturned on to provide the blue light beam IB. In other words, in thesixth operation mode, the blue light source 112B is turned on during theintervals of the blocks R, G, B, and Y, while the red light source 112Ris turned on during the intervals of the blocks R, G, and Y. In thesixth operation mode, the red light source 112R is not only turned onduring the intervals of the blocks R and G, but is also turned on duringthe interval of the block Y. Therefore, the overall brightness of thelight source module 110 is further facilitated.

FIG. 11 is a schematic view illustrating a wavelength conversion wheeland a filter wheel according to another embodiment of the invention.Referring to FIGS. 1 and 11, a wavelength conversion wheel 314 and thefilter wheel 316 of FIG. 11 serve as another embodiment of thewavelength conversion wheel 114 and the filter wheel 116 of the lightsource module 110 of FIG. 1. Like components and elements are describedwith like reference numerals, and details in this respect will not berepeated in the following.

In the embodiment, the wavelength conversion wheel 314 includes a firstwavelength conversion region 314G, a second wavelength conversion region314Y, and a transparent region 314B. The first wavelength conversionregion 314G, the second wavelength conversion region 314Y, and thetransparent region 314B are rotated onto the transmission path of theblue light beam IB by turns. The blue light beam IB is converted by thefirst wavelength conversion region 314G to generate the green light beamIG. The blue light beam IB is converted by the second wavelengthconversion region 314Y to generate the yellow light beam IY. The bluelight beam IB passes through the transparent region 314B. In theembodiment, the filter wheel 316 includes a first filter region 316G, asecond filter region 316R, a third filter region 316Y, and a diffusionregion 316B. The green light beam IG and the red light beam IR passthrough the first filter region 316G, as shown in the filter spectrumillustrated in FIG. 3. The first filter region 316G includes a firstsub-region 316_1 and a second sub-region 316_2. The red light beam IRpasses through the second filter region 316R. The yellow light beam IYpasses through the third filter region 316Y. The blue light beam IBpasses through the diffusion region 316B. In the embodiment, thewavelength conversion wheel 314 and the filter wheel 316 have the samerotation speed. The first wavelength conversion region 314G correspondsto the first filter region 316G. The second wavelength conversion region314Y corresponds to the second filter region 316R and the third filterregion 316Y. The transparent region 414B corresponds to the diffusionregion 416B.

FIGS. 12 and 13 are respectively schematic views illustrating a currentdriving a light source in different operation modes according to theembodiments shown in FIGS. 1 and 11. Referring to FIGS. 1 and 12, in aseventh operation mode of FIG. 12, a symbol 410 marks a current fordriving the red light source 112R, and a symbol 420 marks a current fordriving the blue light source 112B. In the seventh operation mode, whenthe filter wheel 316 rotates, the current 420 for driving the blue lightsource 112B is at the high level H. The blue light source 112B is turnedon to provide the blue light beam IB. The wavelength conversion wheel414 sequentially outputs the green light beam IG, the yellow light beamIY, and the blue light beam IB. When the first sub-region 316_1, thethird filter region 316_Y, and the second filter region 316_R arerotated onto the transmission path of the red light beam IR, the current410 for driving the red light source 112R is at the high level H.Therefore, the red light source 112R may provide the red light beam IR.In other words, the blue light source is constantly turned on during theintervals of the blocks G, Y, R, and B. In addition, the block R furtherincludes a first sub red block R1 and a second sub red block R2. In theseventh operation mode, the green light beam IG and the red light beamIR are mixed to form the block Y, the yellow light beam IY and the redlight beam IR are mixed to form the first sub red block R1, and the redlight beam IY and the red light beam IR are mixed to form the second subred block R2. In addition, the first sub red block R1 and the second subred block R2 are slightly different in color, so as to increase thecolor gamut of the light source module 110. In addition, since the redlight source 112R is also turned on when the filter wheel 316 is rotatedto the first sub-region 316_1, the brightness of the light source module110 may be further facilitated.

Then, referring to FIGS. 1 and 13, in an eighth operation mode, when thefilter wheel 316 rotates, the current 420 for driving the blue lightsource 112B is at the high level H. The blue light source 112B is turnedon to provide the blue light beam IB. The wavelength conversion wheel314 sequentially outputs the green light beam IG, the yellow light beamIY, and the blue light beam IB. When the third filter region 316_Y andthe second filter region 316_R are rotated onto the transmission path ofthe red light beam IR, the current 410 for driving the red light source112R is at the high level H. Therefore, the red light source 112R isturned on to provide the red light beam IR. In other words, the bluelight source is constantly turned on during the intervals of the blocksG, Y, R, and B. In addition, the block R further includes a first subred block R1 and a second sub red block R2. In the eighth operationmode, the yellow light beam IY and the red light beam IR are mixed toform the block R. In addition, the first sub red block R1 and the secondsub red block R2 are slightly different in color, so as to increase thecolor gamut of the light source module. In addition, since the lightsource module 100 does not generate the yellow light beam in the eighthoperation mode, a color purity of the illumination beam IW output by thelight source module 100 is facilitated.

In view of the above, the embodiments of the invention have at least thefollowing advantages effects. In the exemplary embodiments of theinvention, the light source module includes the blue light source, thered light source, the wavelength conversion wheel, and the filter wheel.In addition, the filter spectrum of the first filter region of thefilter wheel includes the first bandwidth for the green light beam topass through and the second bandwidth for the red light beam to passthrough. Based on different combinations of the wavelength conversionwheel and the filter wheel, the light source module drives the bluelight source and the red light source with different types of currents.Therefore, the light source module and the projection apparatus with thelight source module have a broader color gamut, higher brightness andless loss of energy.

The foregoing description of the preferred embodiments of the inventionhas been presented for purposes of illustration and description. It isnot intended to be exhaustive or to limit the invention to the preciseform or to exemplary embodiments disclosed. Accordingly, the foregoingdescription should be regarded as illustrative rather than restrictive.Obviously, many modifications and variations will be apparent topractitioners skilled in this art. The embodiments are chosen anddescribed in order to best explain the principles of the invention andits best mode practical application, thereby to enable persons skilledin the art to understand the invention for various embodiments and withvarious modifications as are suited to the particular use orimplementation contemplated. It is intended that the scope of theinvention be defined by the claims appended hereto and their equivalentsin which all terms are meant in their broadest reasonable sense unlessotherwise indicated. Therefore, the term “the invention” or the likedoes not necessarily limit the claim scope to a specific embodiment, andthe reference to particularly preferred exemplary embodiments of theinvention does not imply a limitation on the invention, and no suchlimitation is to be inferred. The invention is limited only by thespirit and scope of the appended claims. The abstract of the disclosureis provided to comply with the rules requiring an abstract, which willallow a searcher to quickly ascertain the subject matter of thetechnical disclosure of any patent issued from this disclosure. It issubmitted with the understanding that it will not be used to interpretor limit the scope or meaning of the claims. Any advantages and benefitsdescribed may not apply to all embodiments of the invention. It shouldbe appreciated that variations may be made in the embodiments describedby persons skilled in the art without departing from the scope of theinvention as defined by the following claims. These claims may refer touse “first”, “second”, etc. following with noun or element. Such termsshould be understood as a nomenclature and should not be construed asgiving the limitation on the number of the elements modified by suchnomenclature unless specific number has been given. Moreover, no elementand component in the present disclosure is intended to be dedicated tothe public regardless of whether the element or component is explicitlyrecited in the following claims.

What is claimed is:
 1. A light source module, configured to provide anillumination beam, comprising: a blue light source, a red light source,a wavelength conversion wheel, and a filter wheel, wherein the bluelight source is configured to provide a blue light beam, the red lightsource is configured to provide a red light beam, the wavelengthconversion wheel is disposed on a transmission path of the blue lightbeam and has a first wavelength conversion region and a transparentregion, wherein the first wavelength conversion region and thetransparent region are rotated onto the transmission path of the bluelight beam by turns, the blue light beam passes through the transparentregion, and the blue light beam is converted by the wavelengthconversion region to generate a green light beam, and the filter wheelis disposed on transmission paths of the blue light beam and the redlight beam and comprises a first filter region and a diffusion region,wherein a filter spectrum of the first filter region comprises a firstbandwidth allowing the green light beam to pass through and a secondbandwidth allowing the red light beam to pass through, the firstbandwidth and the second bandwidth are separated from each other, andthe blue light beam passes through the diffusion region.
 2. The lightsource module as claimed in claim 1, wherein the wavelength conversionwheel and the filter wheel have the same rotation speed, the firstwavelength conversion region corresponds to the first filter region, andthe transparent region corresponds to the diffusion region.
 3. The lightsource module as claimed in claim 2, wherein the first filter regioncomprises a first sub-region, a second sub-region, and a thirdsub-region, and the red light source is turned on to provide the redlight beam when the first sub-region and the third sub-region of thefirst filter region are rotated onto the transmission path of the redlight beam.
 4. The light source module as claimed in claim 3, whereinthe blue light source is turned on to provide the blue light beam whenthe second sub-region and the third sub-region of the first filterregion and the diffusion region are rotated onto the transmission pathof the blue light beam by turns.
 5. The light source module as claimedin claim 1, wherein the first filter region comprises a firstsub-region, a second sub-region and a third sub-region, and the redlight source is turned on to provide the red light beam when the thirdsub-region of the first filter region is rotated onto the transmissionpath of the red light beam.
 6. The light source module as claimed inclaim 5, wherein the blue light source is turned on to provide the bluelight beam when the first sub-region and the second sub-region of thefirst filter region and the diffusion region are rotated onto thetransmission path of the blue light beam.
 7. The light source module asclaimed in claim 2, wherein the wavelength conversion wheel furthercomprises a second wavelength conversion region, and the blue light beamis converted by the second wavelength conversion region to generate ayellow light beam when the second wavelength conversion region isrotated onto the transmission path of the blue light beam.
 8. The lightsource module as claimed in claim 7, wherein the filter wheel furthercomprises a second filter region and a third filter region, the redlight beam passes through the second filter region, the yellow lightbeam passes through the third filter region, and the second wavelengthconversion region of the wavelength conversion wheel corresponds to thesecond filter region and the third filter region of the filter wheel. 9.The light source module as claimed in claim 7, wherein the first filterregion comprises a first sub-region and a second sub-region, and the redlight source is turned on to provide the red light beam when the firstsub-region of the first filter region, the third filter region, and thesecond filter region are rotated onto the transmission path of the redlight beam.
 10. The light source module as claimed in claim 7, whereinthe red light source is turned on to provide the red light beam when thethird filter region and the second filter region are rotated onto thetransmission path of the red light beam.
 11. The light source module asclaimed in claim 7, wherein the red light source is turned on to providethe red light beam when the second filter region is rotated onto thetransmission path of the red light beam.
 12. The light source module asclaimed in claim 7, wherein the red light source is turned on to providethe red light beam when the second filter region and the first filterregion are rotated onto the transmission path of the red light beam. 13.The light source module as claimed in claim 7, wherein the red lightsource is turned on to provide the red light beam when the second filterregion, the first filter region and the third filter region are rotatedonto the transmission path of the red light beam.
 14. The light sourcemodule as claimed in claim 7, wherein the blue light source is turned onto provide the blue light beam when the filter wheel rotates.
 15. Aprojection apparatus, comprising a light source module, an imagingelement, and a projection lens, wherein the light source is configuredto provide an illumination beam, and the light source module comprises:a blue light source, configured to provide a blue light beam; a redlight source, configured to provide a red light beam; a wavelengthconversion wheel, disposed on a transmission path of the blue light beamand having a first wavelength conversion region and a transparentregion, wherein the first wavelength conversion region and thetransparent region are rotated onto the transmission path of the bluelight beam by turns, the blue light beam passes through the transparentregion, and the blue light beam is converted by the first wavelengthconversion region to generate a green light beam; and a filter wheel,disposed on transmission paths of the blue light beam and the red lightbeam and comprising a first filter region and a diffusion region,wherein a filter spectrum of the first filter region comprises a firstbandwidth allowing the green light beam to pass through and a secondbandwidth allowing the red light beam to pass through, the firstbandwidth and the second bandwidth are separated from each other, andthe light source module provides an illumination beam based on the bluelight source, the red light source, the wavelength conversion wheel, andthe filter wheel; the imaging element is disposed on a transmission pathof the illumination beam and configured to convert the illumination beaminto an image beam; and the projection lens is disposed on thetransmission path of the image beam and configured to project the imagebeam to a projection target.
 16. The projection apparatus as claimed inclaim 15, wherein the wavelength conversion wheel and the filter wheelhave the same rotation speed, the first wavelength conversion regioncorresponds to the first filter region, and the transparent regioncorresponds to the diffusion region.